Closed top for gas stoves



Jan. 13, 1931. A. H. TINNERMAN 1,788,644

CLOSED TOP FOR GAS STOVES Filed May e, 1929 4 Sheets- Sheet 1 FIE...L

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Jan. 13, 1931. A. H. TINNERMAN 1,738,644

' CLOSED TOP FOR GAS STOVES Filed May 6. 1929 4 Sheets-Sheet 3 F IELBgmicnkoz if/wffim F I 5.,5 $7M Jan. 13, 1931. A. H. TINNERMAN 1,788,644

CLOSED TOP FOR GAS STOVES Filed May 6, 1929 4 Sheets-Sheet 4 F'IB BFIEGLEIV dim u e W UNETED STATES FFICE ALBERT H. TINNERMAN, F CLEVELAND,OHIO CLOSED TO]? FOR GAS STOVES Application filed. May 6,

The prevailing practice in the construction of gas ranges is to utilizean open grate frame on the burner box section. The principal objectionto this type of construct on 5,: is the fact that the products ofcombustion escape into the room and that the grate frame is difficult tokeep clean. The desire of manufacturers therefore has been to make aclosed top, but the chief objection has been the difliculty ofpreventing the formation of carbon monoxide, and its escape into theroom when the burners are lit on a cold stove. Until the stove is warmedup,

there is not suflicient heat developed to cre- 1 ate a satisfactorydraft, and as a result the products of combustion accumulate beneath thetop and dampen the flame. This causes the formation of carbon monoxideand allows it to escape into the room.

The usual form of construction for removing the products of combustionhas been to extend the passageway of a closed top into the oven box andthus to permit escapement of gases through the oven and then into theflue. This procedure however allows the gas to expand into a relativelylarge space as soon as it enters the oven, and then causes it to passthrough a restricted opening when it enters the stove 0 flue. This notonly overcharges the oven,

but also interferes seriously with the successful maintenance of auniform temperature in the oven.

A. further consideration in connection with the use of closed topsarises where a closed top is built separate from the stove and isintended to be placed on the stove in lieu of the open grate. In suchcases, the usual grate frame construction restricts the location of thegas outlet to a point approximately one inch below the underside of theclosed top. It is thus evident that considerable space is provided forenabling roducts of combustion to accumulate beneat the top, and thatsuch products can escape into the room as soon as the lids are open.

The principal object of the present invention is to provide a stoveconstruction which permits the use of a closed top either as a part ofthe stove as originally made. or as a 1929. Serial N0. 360,973.

substitute for the open grate, Without resulting in any of theobjections heretofore referred to. A further object of the presentinvention is to expedite the movement of the products of combustion soas to avoid any possibility of interfering with the oven temperature,and to avoid particularly the formation of carbon monoxide during theoperation of any of the burners. My invention also contemplates theprovision of means for making flue connections which are adapted to beinterchanged with either a right or left hand stove.

In the drawings, Fig. 1 is a perspective view of a stove embodying myinvention; Figs. 2, 3 and 4 are vertical sections taken on thecorrespondingly numbered lines in Fig. 1; Fig. 5 is a rear elevation ofpart of the stove showing the flue connections; Fig. 6 is a verticalsection taken on the line 6-6 in Fig. 5; Fig. 7 is a vertical sectiontaken through the stove showing the use of a flue closure plate, whichis used when the closed top is removed; Fig. 8 is a perspective view ofthe closure plate shown in Fig. 7; Fig. 9 is a perspective view of astove showing a modification of my invention; Figs. 10 and 11 aresections taken on the correspondingly numbered lines in Fig. 9; Fig. 12is a plan view of a'stove having another modification of my invention;and Fig. 13 is a vertical section taken on the line 1313 in Fig. 12.

Referring now to Fig. 1, 10 indicates a stove having the usualarrangement of burner box and oven box. A grate frame 11 is shown asextending around the burner box while a splash plate 12 is illustratedas extending vertically from the rear edge of the grate frame in thecustomary manner. The oven shown at 13 has a flue opening 14 which leadsinto a flue pipe 15, as is shown particularly in Fig. 6. When an opengrate is used upon the stove, it is supported in place upon the graterest 16 which extends around the inner edge of the frame. The open grateis indicated at 17, for example, in Fig. 7.

The closed top, which embodies the present invention, is shown at 20 asa flat memher, which rests upon the grate frame, and

covers the space normally occupied by the open grate. In the preferredarrangement, the member 20 has sloping walls 21, which extend downwardlyand which are apertured at 22 at spaced intervals. A flat strip 19 ofsheet metal may extend around the top of the frame and protect it whilethe closed top is resting thereon.

To connect the space beneath the closed top with the flue, I have shownan opening 24 in the splash plate which provides a passageway into abranch flue 25 at the rear of the stove. This branch flue is arranged tobe connected to the main flue 15 at a point behind the stove where it isnormally concealed from view. To facilitate movement of the products ofcombustion from the space beneath the closed top and into the flue, Ihave shown the top as being shaped to provide a conduit, which extendsthrough the opening in the splash plate, and is connected at the rear ofthe stove to the branch flue. Part of this conduit is shown at 26 infront of the splash plate and another part is shown at 27 behind thesplash plate. Parts 26 and 27 are preferably integral with the top 20,wherefore the necessity for securing fastening members through theenameled splash plate is obviated. The conduit when fastened to the fluethen serves to hold the top from moving outwardly. A tongue 28 engagesthe inner edge of the frame and prevents lateral movement in onedirection while the oven wall engages the edge 29 and prevents lateralmovement in the opposite direction.

A convenient way of connecting the branch flue to the conduit leadingfrom the closed top comprises a coupling 30, which has tongues 31extending into the conduit and a flange 32 extending outside the branchflue. Another coupling member 33 may be mounted upon the elbow 34 whichleads from the oven to the main flue. This last named coupling may haveflanges 35 and 36, which respectively engage the elbow 34 and the mainflue 15.

Ii hen the closed top is not used, the opening in the splash plate isnormally closed by an enameled cover plate 37, which rests upon thegrate frame, and is arranged to be held in position by means of a springclamp 38. This clamp is shown as a one-piece strip of spring metal whichis fastened at the midportion thereof to the back of the cover plate,and which is arranged to engage yieldably the rear face of the splashplate upon the extended portions 39 and 4:0. This cover plate can thusbe readily removed whenever the closed top is intended to replace theopen grate.

In Fig. 9, I have shown a modification of my invention in the nature ofa closed top which is positioned within the grate rest 16a and isprovided with an integral conduit 46 which passes through the splashplate and is connected to the flue at the back of the stove. In thismodification, the upper surface of the closed top is flush with theupper surface of the grate frame. Furthermore, the rear side 17 of thegrate frame is cut to permit the conduit 46 to pass therethrough. Thus,the conduit need not project above the top of the stove to anobjectionable degree.

In Figs. 12 and 13, I have shown another modification of a closed top48. In this case, the top is supported upon the grate rest 16?) in thesame manner indicated in the modification shown in Fig. 9. The addedfeature shown in Fig. 12 is the provision for Venting products ofcombustion. As shown, such provision comprises apertures 49 which extendthrough the top and along lines adjacent the marginal edges thereof. Ifdesired, the conduit 50 may pass through therear Wall 51 of the grateframe without rising above the upper surface thereof, until it passesthrough the splash plate.

The apertures which are shown in the closed top are suitable forpreventing a dampening action upon the flame of any of the burners ifthey should be ignited when the stove is cold. Under such circumstances,it is ditficult to start the products of combustion moving toward theflue with the necessary velocity. Unless some provision is made forremoving the gases, such dampening action will be apt to cause the formation of carbon monoxide which can escape into the room. The apertures22, which I have provided around the marginal edges of the closed topserve to prevent the accumulation of products of conbustion beneath thetop and thus prevent the formation of carbon monoxide gas. As theproducts of combustion normally escape into the room when the open grateis used, there is no danger in continuing this practice, particularlysince it only occurs for a relatively short period of time until thestove is heated. Thereupon, the products of combustion will pass in thenatural manner into the flue. Another important advantage in the use ofthe apertures is that ample secondary air can be supplied for supportingcombustion at the rear burners.

I claim:

1. In a gas stove, the combination with a grate frame, of a splash plateassociated therewith, and having an aperture therein, a closed topresting upon said frame, a conduit associated with the top and extendingthrough said aperture, and a flue extending behind the splash plate andconnected with said conduit.

2. In a gas stove, the combination with an oven box, of a burner box, aclosed grate for the burner box, a conduit having the Walls thereofintegral with the grate and G2?- tending through the wall of theburnerbox, and another extending through the oven box, and detachablemeans connecting said conduits to form a common flue.

3. In a gas stove, the combination with a burner box, of a splash plate,a closed top for said box, a conduit leading from the space beneath saidtop through the splash plate, and a flue connected to said conduit.

4;. In a gas stove, the combination with a burner box of a splash platehaving an aperture therein adjacent the midportion of the burner box, aclosed top for said box, said top having a portion thereof along therear edge thereof extending upwardly and passing through said aperture,said upward- 1y extending portion providing a conduit for the productsof combustion, and a flue connected with said conduit at the rear of thestove.

5. A closed top for a gas stove, comprising a flat member havingmarginal edges thereof adapted to rest upon a grate frame and having aportion thereof along one edge shaped to provide aconduit for productsof combustion, said conduit being adapted to be directly connected to aflue.

6. In a gas stove, the combination with a grate frame, of a splash plateassociated therewith, and having an aperture therein, a removable closedtop resting over the frame, and having spaced vents disposed along someof the marginal edges thereof for allowing the escape of excess productsof combustion into the room in which the stove is located, there being aconduit associated with the top and extending through the splash plate,and a flue extending behind the splash plate and connected with saidconduit.

7 In a gas stove, the combination with an oven box, of an associatedburner box, a splash plate having an aperture extending therethroughadjacent the top of the burner box, a closed top for said burner box, are movable closure for said aperture, and said top having a portionthereof adapted to extend through the aperture when the cover is removedtherefrom, a flue leading from the oven box, and detachable meansleading from the conduit to the flue.

In testimony whereof, I hereunto afiix my signature.

ALBERT H. TINNERMAN.

